hewitt



2 Sheets-Sheet 1.

(N0 Medan I P G: HEWEYEE 2300333 0? AND APPARATUQ Fe- Patented 'June 1 2, 1894;

INVENTOI? ATTORNEYS.

- ot the liquid glue with the cylinders A, A.

The movement of the glue resulting from its ment within itself, as indicated by the arrows,

- thus causing the dilferentportions of the body of the glue to come into contact with the cylinders A, A. This is an important action, as the conductivity of the liquid glue for heat is low, and as in other viscous liqnids the cooling cannot be as rapidly effectcd by conduction as it is by convection. The same act-ion occurs between the other cylinders of the series so long as the glue has not congealed. When the glue reaches the last cylinder of the series, which in the present case is the cylinder A, it is cooled and set so that it can be removed by the endless cords or netting carried by the cylinders A and A The glue supply, as well the speed of rotation of the cooling cylinders, is regulated according to the time required to cool and set the glue. \Vhen the glue is to be dried in a single thickness it is carried forward and delivered on nets on which it is dried out in the usual way. \Vhon it is de sired to produce sheets thicker than can conveniently be made in this way, a second se rics of cylinders A, A, &c., is placed below the first, as shown in Fig. l, and the'sheet of glue formed by the first series of cylin lcrs is delivered to the sheet of glue formed y the second series, and the two sheets are made to unite, and when necessary, by heat from the stea n pipe it placed in front of the cylinder A of the upper series and the endless apron of cords or netting of the lower series, so that the sheet delivered by the lower series passes under the steam pipe. The two sheets are united in this manner and carried forward and dried. \Vhere two series of cylinders are used, the endlessapron of cords or netting of the upper series will be placed in an inclined position, as shown'in Fig. L, while the end less apron oi the lower series will be preferably arranged horizontally. It is obvious that when the sheet delivered by the upper series of cylinders is tough and tenacious, it may be delivered to the lower sheet without employing the inclined endlesaapron.

In making thick sheets of glue advantage is taken of the low temperatn re of the wholly or partly cooled sheets, for cooling an additional laycrof glue [lowedover a sin gle sheet, or introduced between the upper and lower sheets while they are being formed on or de livered from the machine. This is accomplished by flowing liquid glue on the lower sheet after it is partly set or set, and partly or entirely cooled. The liquid glue which is supplied through the nozzle 0, (Fig. 2) spreads out on the lower sheet and is carried along and brought into contact with the upper sheet which also assists in co fling.

When it is desired to unite the two sheets of glue by bringing their upper or natural in a cooling liquid as they revolve,

faces into contact, two series of cylinders are arranged as shown in Fig. 5, with the terminal cylinders of the series adjoining each other, the two series being arranged to turn in opposite directions so that when the sheets are delivered, the natural face of the sheet delivered by the right hand series will contact with the natural face of the sheet delivered by the left hand series, and in this case as in the other, the steam pipe may be introduced to superficially warm the sheets and cause them to unite as they come into contact, when necessary. In the case shown in Fig. 6, the series of cylinders are arranged one above the other, and they are made to rotate in opposite directions, but the upper surface of the sheet delivered from the lower series of cylinders and formed by contact with the said cylinders is made to contact with the under surface of the sheet delivered from the upper series of cylinders, thus bringing the natural surfaces of the sheets upon the outside, the surfaces of the two sheets formed by contact with the cylinders being'brought into contact with each other and nnited,forming the thicker sheet.

To insure the uniting of the sheets of glue, and to exclude air bubbles,I carry the double sheet over the roller 70', and allow the light roller 7&2 to press upon the upper sheet as it passes away from the machine.

When sheets are delivered in the manner illustrated in Fig. 5, any figure, imprint, trade-mark, or the name of the manufacturer may be impressed upon the surface of the glue, where it will remain after the glue is dried, and in the case of the method shown in Fig. (5, the sheet of glue will have on both sides the luster due to the preservation of the natural surface.

\Vhen it is desired to combine different grades of glue in the same sheet,I d liver the different grades in liquid form to the differ: ent series of cylinders. This method of procedure is advantageous, for example, when it is desired to face sheets of dark colored glue with glue of a lighter color, or to facilitate drying of slow-drying, low grades of glue, by producing a skin or coating of tehacious glue on opposite sides oifthe sheet of low-grade glue, for retaining the low grade glue in the form of a sheet during drying.

I may employ a stream of water from a body of water naturally cooled for circulation in the cylinders A A, c, or I may use the same water, or brine or other medium, keeping it in circulation through the rollers and through a refrigerating apparatus, or instead of applying the cooling medium to the interior oi the cylinders I may apply it to the out side of the cylinders by causing them to dip the said liquid being contained in pans supported under the cylinders, as shown in dotted lines in Fig. 2. Where the low of Water is rapid through the cylinders A, A, the it is immateiial at which end. of the series the water is introduced, but when the flow of water is not [be in absolute contact, as it is suflicient that they should be in approximate contact with each other.

By the term natural surface as used herein, I mean the upper surface formed by the. free flowing of the liquid glue without contact with solids in any form. By theterm rough surface as applied herein, I mean the surface of the glue sheet formed by contact with the cooling cylinder.

When it is desired to cool liquid glue and remove it from the cylinders in liquid form the speed of the rotating cylinders or the temperature or the flow of the cooling medium may be regulated to secure the desired result. The cooled liquid glue is removed from the delivery cylinder by ascraper, as shown at the right in Fig. 4.

Although I have shown the series of cooling cylinders arranged in a horizontal plane, I do not limit myself to this arrangement as the series maybe inclined at any desired angle.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent- 1. In a glue cooler, the combination of two or more cylinders arranged to revolve in the same direction in close proximity one to another, the first cylinder being arranged to deliver the cooled glue to the second cylinder, and means, substantially as described, for cooling the cylinders.

2. In a machine for formingliquid glue into sheets, the combination of two or more cylinders arranged to revolve in the same direction in close proximity one to another, and a supply for delivering the liquid glue to the cylinders, substantially as described.

3. In glue cooling apparatus, the combina tion of two glue coolers, one cooler being arranged to deliver the sheetof glue to the sheet delivered by the other cooler, thereby forming one sheet, substantially as specified.

I. In glue-cooling apparatus, the combination of two series of cooling cylinders, one series being arranged to deliver the sheet of glue to the other series, and means for cementing the two sheets of glue together, substantially as specified.

5. The method of cooling glue, which consists in bringing a body of liquid glue into contact with a body of glue cooled below the.

gelatinizing point,rernoviug the heat from the liquid glue by contact with the body of cooled gelatinized glue, and causing the body of liquid glue to attach itself to the body of gelatinized glue without mixing the two bodies of glue, thereby forming a single sheet of glue,

which consists at first of a layer of gelatinized glue and a layer of liquid glue, and which, by the absorption of heat from the liquid glue by the cooled glue, becomes a single thick sheet of gelatinized glue, substantially as specified.

6. The method of forming a thick sheet'of glue, which consists in separately formingtwo or more sheets of gelatinized glue, superposing said separately formed sheets, causing the adjacent surfaces of the sheets to adhere, and

finally evaporating the sheets to dryness, sub- 7 5 stantially as herein specified.

PETER. COOPER HEWITT. Witnesses: F. W. IIANAFORD, EDGAR TATE. 

